Method of manufacturing can closures



March 1, 1932. HIRSCH ET AL 1,848,012

METHOD OF MANUFACTURING CAN CLOSURES Filed April 4, 1930 INVENTOR BY M ATTORNE s.

' Patented Man], 1932 UNITED sT PATENT OFFICE,

LEONARD HIRSGH, F LYN DHURST, AND EDWIN A. HARRISS, 0F ORANGE, NEW JERSEY,

AssIGNoRs TO B. B. DAVIS 01? NEW JERSEY I COMPANY, OF HOBOKEN, JERSEY, A CORPORATION METHOD or mnuraoruame can cLos unns Application filed April 4, 1930. SerialN'o. 441,447, v

This invention relates to a novel and improved method of forming ametal closure for cans, and will be best understood from the following description and the annexed drawings, in which we have shown a selected way of practicing'the invention and in. which Fig. 1 is a view partly in elevation and partly in section showing the top of acan having applied thereto a closure made according to our novel method.

.Fig. 2 is a section on the same plane as the sectional part of Fig. 1, showing a portion of the closure'on an enlarged attachment to the can.

Figs. 3, 4 and 5 are views showing successive steps performed on a blank, to form the closure.

In Fig. 1, the invention is shown as applied to the top' of a can 1, the top ,2 being shown as formed of sheet metal secured to the can by means of a suitable seam 3, and having a recess 4 adapted to receive a plug 5. The recess 4 is preferably surrounded by a cylindrical wall 6, which may be formed by operating upon a flat piece of sheet metal to bring it to the form shown in Fig. 3. A sealing member 7' is then disposed in the rescale, before .cess extending entirely across the same, as

shown in Fig. 4, this sealing: member being of relatively frangible material 'asvcompared with the relatively non-frangible material represented by the sheet metal of the top. It will be seen that this sealing member is provided with a circumferential flange 8 which closely contacts with the wall 6 of the recess, and that the edge of the flange is placed closely adjacent the edge of the wall. I

When in this position, the flange and the edge portion of the wall may be spun inwardly to theposition indicated at 9 in Fig. 5, wherein'it will be seen that the edge of the wall will be folded over and entirely locked with the edge of the flange. This is still better shown in Fig. 2. The result is a one-piece can top having an opening thereinclosed by a sealing member secured .to the top adjacent Serial No. 351,068, showing a specifically dif ferent form of joint.

When the can contents are to be used, the relativelyfrangible material 7 may be punctured and removed by a suitable. cutting tool, thus exposing the contents which may be again protected by re-insertion of the plug '5 which, of course, is removedvbefore puncturing of the sealing membera While we have shown the inventionasapplied to the top, it is to be understood that, if desired, it may be applied also to the plug, in which case the contents will be permanently exposed or some other temporary closure provided therefor;

l. The method of manufacturing a can I top which comprises forming the top of "a single piece of sheet material with a hole therethrough surrounded by a peripheral wall, placing within said hole a sealing member having a flange in contact 'with said wall and extending towards the edge thereof but spaced therefrom, and rolling inwardly the edge portion of the wall and said flange to lock the two together.

2. The method of manufacturing a can top which comprises forming the top of a single piece of sheet m'aterial with a hole i.

therethrough surrounded by a peripheral wall, placing within said hole a sealing memk her having a flange in contact with said wall and extending towards the edge thereof, and

rolling inwardly the edge portion of the 7 wall. andsaid flange to lock the two together;

with the edge of the wall overlapping the edge of the flange on the sealing member.

I LEONARD HIRS CH. EDWIN A. HARRISS.

the opening by a permanent mechanical air-p tight joint. This combination is claimed 

